help me in design this network

hello i have 4 server blade hp 460c 2 cpu total 12 core for every server
ram 96 giga for every server
2 hd total 600 gb
i plan to install exchange server 2010 by vmware
so i want 4 server virual 2 mb and 2hub and cas
so can any one help me to design specification for every server how many core how many ram
user in exchange about 700 users

Who is Participating?

Where shall I send my bill for the network design consultancy?
It is asking a bit much to ask people on a forum to do a network design for 700 users. If you aren't capable, hire a consultant to assist, because there are many factors that have to be taken in to account.

What I will say is that it is no longer best practise to split the Hub/CAS and mailbox roles. Best practise is to now have all of the roles on all of the servers. If you want to use load balancing (which is the main reason people want to split Hub/CAS out, so they can use WNLB), then save the money from the two additional Exchange licences and put it towards a proper load balancer.